‏الأيمان : Hadeeth No:4051 Abu Musa reported: We walked on foot and came to Allaah's Prophet (may peace he upon him) asking him to provide us with mounts. The rest of the hadith is the same....

‏الزكاة : Hadeeth No:2143 Jabir b. Abdullah reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: A tenth is payable on what is watered by rivers, or rains, and a twentieth on what is watered by camels....